Closed buoy liquid level meter

The utility model provides a closed buoy liquid level meter, which relates to the technical field of liquid level meters, and adopts the technical scheme that the closed buoy liquid level meter comprises a buoy, a heavy hammer, a ruler plate, a left corner pulley and a right corner pulley, the heavy hammer is arranged on the ruler plate in a sliding manner, a pointer is arranged on the heavy hammer, the buoy is connected with the heavy hammer through a pull rope, and the pull rope bypasses the left corner pulley and the right corner pulley; a left pulley shell is installed at the position of the left corner pulley and wraps the left corner pulley, a right pulley shell is installed at the position of the right corner pulley and wraps the right corner pulley, the steel wire rope located below the left corner pulley is provided with a pipe base, and a first sleeve is connected between the pipe base and the left pulley shell. A second sleeve is connected between the left pulley shell and the right pulley shell, a